GNOME Screen Ruler lets you measure distances vertically or horizontally on your screen in Pixels, Inches, Centimeters, Picas, Points, and as a percentage of the ruler's length.

Font and colors are customizable.

New in Version 0.7
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* Rewrite in Ruby
* First appearance in GNOME CVS ( http://cvs.gnome.org/viewcvs/gruler/ )
* The "Track Mouse Position" feature is not yet in the Ruby version, but is otherwise feature-equivalent with 0.6.

Best,
-Ian McIntosh